Ответ:
[tex](3 {x}^{2} - 5x) - (7 {x}^{2} - 4x) + (6 {x}^{2} + 5x) = 3 {x}^{2} - 5x - 7 {x}^{2} + 4x + 6 {x}^{2} + 5x = 2 {x}^{2} + 4x [/tex]
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Ответ:
[tex](3 {x}^{2} - 5x) - (7 {x}^{2} - 4x) + (6 {x}^{2} + 5x) = 3 {x}^{2} - 5x - 7 {x}^{2} + 4x + 6 {x}^{2} + 5x = 2 {x}^{2} + 4x [/tex]